Every leaving raises the offboarding checklist
The offboarding checklist (from the company's offboarding template) is now raised whichever way somebody leaves: Terminate, Plan separation, an offboarding record, the day a planned leaving takes effect, or an approved resignation. Somebody who already has an open one keeps it.
A planned leaving starts its checklist when it is planned, dated from the leaving day, so the handover and the equipment are arranged before the day rather than after.